ICPAM-16 & PAMS-7 (Antalya / Online)
PAMS-P3: Flexible pressure sensor for mapping the pressure on the sole of the foot
F. Pistriţu 1,2, M. Gheorghe3 , E. Manea1 , V. Dediu1 , O. N. Ionescu1 , M. Suchea1
1National Institute For Research And Development In Microtechnologies – IMT, 077190, Bucharest, Romania
2Doctoral School of Electronics, Telecommunications and Information Technology, University Politehnica of Bucharest, 061071 Bucharest, Romania
3NANOM MEMS SRL, Brasov, Romania
Abstract
In this work, we report the realization of a flexible pressure sensor, integrated in an insole for pressure mapping at the level of the sole of the foot.
The system for pressure mapping uses a number of 12 pressure sensors [1,2] integrated in an insole, but also a block for the signal electronics receives and stores the information provided by the sensors. The data are then transferred to a PC, for processing and display as a map of the sole of the foot. The purpose of designing flexible pressure sensors was to be able to be integrated into an insole, to obtain a flexible pressure mapping system. The pressure sensors were positioned on the insole in the most important areas of the sole of the foot. In Figure 1a) the designed meander resistor is presented. Figure 1b) shows the flexible kapton substrate printed through screen-printing technology. For the integration of the pressure sensors on the insole, we used two insoles, one being the base, and the other being processed to be able to integrate the micro-structured elastomeric substrate into it. The integration of the flexible Kapton substrate followed (Figure 1c). The insole was then connected to the signal electronics block via a 24 wire AWG26 ribbon cable. The entire assembled system is presented in Figure 1d). To create this pressure mapping system, the elastomeric substrate of the pressure sensor was designed and made. Then followed the design and 31 realization of the meander resistor printed on the flexible Kapton substrate.
The ink used for printing in screen-printing technology was designed and made. To measure and record the values given by the 12 pressure sensors on the insole, a software with a reading and memorizing speed of up to 8 sets of measurements per second was developed and tested. The signal electronics for the developed pressure sensors were designed and made.
Acknowledgments: IMT’s contribution was partially supported by the “MicroNEx”, Contract nr. 20 PFE /30.12.2021, financed by the Ministry of Research, Innovation and Digitization through Program 1—Development of the National R&D System, Subprogram 1.2— Institutional Performance—Projects for Institutional Excellence, Romanian Ministry of Research, Innovation and Digitalisation, through the μNanoEl, Cod: 23 07 Core Programme, and partially supported by PNRR/2022/C9/MCID/I8 CF23/14 11 2022 contract 760101/23.05.2023 financed by the Ministry of Research, Innovation and Digitalization in “Development of a program to attract highly specialized human resources from abroad in research, development, and innovation activities” within the– PNRR-IIIC9-2022–I8 PNRR/2022/Component 9/investment 8.
PAMS-P4: WO3 thin films for potential use in gas sensors: Effect of Mo and Cr Doping
A. G. M. Popescu1,2, I. V. Tudose3 , M. Manica1 , C. Pachiu1 , C. Romanitan1 , O. Brincoveanu1 , R. Gavrila1 , P. Schiopu2 , M. Vladescu2 E. Koudoumas1,3 , M.P. Suchea 1,3
1National Institute for Research and Development in Microtechnologies (IMTBucharest), Bucharest 023573, Romania
2Doctoral School of Electronics, Telecommunications and Information Technology, National University of Science and Technology POLITEHNICA Bucharest, Bucharest 060042, Romania
3Center of Materials Technology and Photonics, Hellenic Mediterranean University, Heraklion 71410, Greece
Acknowledgments: IMT’s contribution was partially supported by Romanian Ministry of Research, Innovation and Digitalisation through the μNanoEl, Cod: 23 07 core Programme, and partially supported by PNRR/2022/C9/MCID/I8 CF23/14 11 2022 contract 760101/23.05.2023 financed by the Ministry of Research, Innovation and Digitalization in “Development of a program to attract highly specialized human resources from abroad in research, development, and innovation activities” within the – PNRR-IIIC9-2022 – I8 PNRR/2022/Component 9/investment 8.
Poster – Premiul ICPAMS oferit de Association ICPAMS
• ICPAMS Award (150 EUR) offered by Association ICPAMS for the poster presentation delivered by Andreea Gabriela Marina Popescu, entitled: WO3 Thin Films for Potential Use in Gas Sensors: Effect of Mo and Cr Doping.
T3-PL6: Advances in metal oxides for photocatalysis, gas sensing, and electrochromic applications
Mirela Petruta Suchea1,2
1 National Institute for Research and Development in Microtechnologies – IMT Bucharest, 126A, Erou Iancu Nicolae Street, 077190, Voluntari-Bucharest, Romania;
2 Center of Materials Technology and Photonics, School of Engineering, Hellenic Mediterranean University, 71410 Heraklion, Crete, Greece
Metal oxides have emerged as versatile and essential materials in various advanced technological applications due to their unique structural, electronic, and catalytic properties. This talk will explore recent developments and advances in the utilization of metal oxides for photocatalysis, gas sensing, and electrochromic devices. In the realm of photocatalysis, the focus will be on the design and engineering of metal oxide nanostructures that enhance light absorption, charge separation, and surface reactions, thereby improving the efficiency of processes such as water splitting and organic pollutant degradation. The talk will highlight innovative strategies, including the incorporation of dopants, heterostructures, and surface modifications, which have significantly advanced the field. For gas sensing applications, the discussion will cover the sensitivity and selectivity of metal oxide sensors to various gases, influenced by factors such as particle size, morphology, and surface chemistry. The development of nanocomposites and hybrid structures to achieve high-performance sensors with rapid response and recovery times will be examined. 179 The optoelectronic sector benefits from metal oxides through their exceptional electronic and optical characteristics, such as wide band gaps, high electron mobility, and strong luminescence. Materials like pure and doped ZnO, and TiO2 are being tailored for use in photodetectors, and transparent conductive oxides (TCOs), contributing to the development of next-generation displays, communication devices, and photovoltaic systems. Throughout the presentation, emphasis will be placed on the interdisciplinary approaches combining materials science, nanotechnology, and surface engineering, which are driving the advancements in these areas. Case studies of recent research projects and potential commercial applications will be discussed, providing a comprehensive overview of the current state and prospects of metal oxides in these critical applications. By understanding and harnessing the properties of metal oxides, we can develop more efficient, responsive, and durable materials that contribute to sustainable energy solutions, environmental monitoring, and smart technologies.
Acknowledgments. IMT’s contribution was partially supported by the Romanian Ministry of Research, Innovation and Digitalisation through the “μNanoEl,” Cod: 23 07 core Programme and project PNRR CF23/ 14 11 2022 financed by the Ministry of Research, Innovation and Digitalization in I8. Development of a program to attract highly specialized human resources from abroad in research, development, and innovation activities within the – PNRR-III-C9-2022 – I8 PNRR/2022/Component 9/investment 8. HMU contribution to this work was partially supported by NATO Science for Peace and Security Programme, grant G5868.
T16-I1: Advances in Metal Oxide Nanostructures Fabricated via Electrospinning-Calcination: Unveiling the Potential for Photocatalytic Applications
Petronela Pascariu1,2
1 ”Petru Poni” Institute of Macromolecular Chemistry, 41A Grigore Ghica Voda Alley, 700487, Iasi, Romania
2National Institute for Research and Development in Microtechnologies (IMTBucharest), Bucharest, 023573, Romania
The fabrication of metal oxide nanostructures has become a focal point in materials science due to their distinctive properties and a vast array of applications, ranging from energy storage and catalysis to sensors and biomedical uses. Among the various fabrication techniques, electrospinning followed by calcination has proven to be a robust and versatile method for producing metal oxide nanofibers with tailored morphologies and compositions. This study will delve into recent advancements, with a particular emphasis on the photocatalytic applications of these nanostructures, alongside a broader exploration of their multifunctional capabilities. This work reviews recent advances in photocatalysis using metal oxide semiconducting materials doped with various metals (Er, Sm, La, Nd, Ce, Pr, etc.) [1-5]. These materials, synthesized through the electrospinning-calcination method, are employed for the removal of organic pollutants [1-3]. The 27 synthesis process, characterization, application, and photocatalytic mechanisms of these semiconducting catalysts are detailed. The study demonstrates that doping with different metals enhances the photocatalytic performance of these materials. Numerous studies have tested these metaldoped metal oxide semiconductors as photocatalysts for degrading pollutants like methylene blue, Congo red, ciprofloxacin, metronidazole, etc. under UV/visible light irradiation. The research also elucidates the kinetics involved in the photodegradation process. The effectiveness of the doping of these materials was demonstrated by evaluating the photocatalytic activity and the rate constants (10-1 × min-1 ). The study highlights the synergistic effects of key factors such as the initial concentration of pollutants (mg/L) and the catalyst dose (% w/v) on photodegradation efficiency. Additionally, the presence of small amounts of lanthanide dopants has been shown to achieve up to 100% pollutant removal efficiency. Notably, all photocatalysts demonstrated excellent reusability, maintaining performance even after five cycles under identical conditions.
Acknowledgments: This research was partially supported by CF23/ 14 11 2022 financed by the Ministry of Research, Innovation and Digitalization in Development of a program to attract highly specialized human resources from abroad in research, development, and innovation activities within the – PNRR-III-C9-2022 – I8 PNRR/2022/Component 9/investment 8.
T9-I2: Raman Microscopy and Spectroscopy: Advanced Characterization of Metal Oxide-Based Materials for Optoelectronic Applications
Cristina I. Pachiu
National Institute for Research and Development in Microtechnologies – IMT Bucharest, 126A, Erou Iancu Nicolae Street, 077190, Voluntari-Bucharest, Romania
This presentation encapsulates the pivotal role of Raman microscopy and spectroscopy in the study of metal oxidebased materials for advanced optoelectronic applications, with a specific focus on their potential in EMI shielding. The presented work aims to highlight the nuances and 49 complexities of using these materials in cutting-edge technologies, emphasizing the importance of detailed material characterization. The exploration and development of metal oxide-based materials have garnered significant attention due to their unique physical and chemical properties, which are highly beneficial for optoelectronic applications [1,2]. Among these, titanium dioxide (TiO₂) and zinc oxide (ZnO) are prominent for their wide band gaps, high chemical stability, and excellent optical transparency. These materials are particularly suited for applications in electromagnetic interference (EMI) shielding, sensors, and electronic devices. Raman microscopy and spectroscopy provide detailed information about the vibrational modes of molecules and crystals, allowing researchers to infer structural and compositional data. For TiO₂ and ZnO, these techniques are invaluable for identifying phases, detecting defects, and analyzing crystallinity. The Raman spectra of these oxides are sensitive to changes in morphology, doping, and surface interactions, making them ideal for in-depth material analysis [3]. The potential of TiO₂ and ZnO in EMI applications lies in their dielectric properties and ability to absorb and scatter electromagnetic waves. Raman spectroscopy can be utilized to optimize these properties by providing a detailed understanding of the material’s microstructure [4-6]. For instance, the presence of defects such as oxygen vacancies in TiO₂ can enhance its dielectric constant, making it a better EMI shielding material. Similarly, doped ZnO can exhibit enhanced electrical conductivity and tunable optical properties, critical for effective EMI shielding. Raman microscopy and spectroscopy provide vital insights into the structural and electronic properties of these 50 materials, which are essential for optimizing their performance in optoelectronic and EMI applications. As the demand for high-performance materials in electronic devices continues to grow, Raman-based characterization will remain at the forefront of material science research, driving innovation and discovery.
Acknowledgments: This contribution was partially supported by the “MicroNEx”, Contract nr. 20 PFE /30.12.2021, financed by the Ministry of Research, Innovation and Digitization through Program 1—Development of the National R&D System, Subprogram 1.2—Institutional Performance—Projects for Institutional Excellence, Romanian Ministry of Research, Innovation and Digitalisation, through the μNanoEl, Cod: 23 07 Core Programme, and partially supported by PNRR/2022/C9/MCID/I8 CF23/14 11 2022 contract 760101/23.05.2023 financed by the Ministry of Research, Innovation and Digitalization in “Development of a program to attract highly specialized human resources from abroad in research, development, and innovation activities” within the– PNRR-IIIC9-2022–I8 PNRR/2022/Component 9/investment 8.
T9-I2: Non-Destructive Evaluation of the Microstructure by Rietveld Refinement: A Case Study on Rare Earth-Doped ZnO
Cosmin Romanitan
National Institute for Research and Development in Microtechnologies (IMTBucharest), Bucharest, 077190, Romania
The integration of rare earth (RE) elements into ZnO matrices has emerged as a promising avenue for enhancing the material’s electronic, optical, and magnetic properties, making them ideal for a broad range of applications, from optoelectronics to spintronics. However, understanding the microstructural changes induced by RE doping is crucial for optimizing these properties and ensuring consistent performance in devices. X-ray diffraction (XRD), coupled with Rietveld refinement, offers a powerful, non-destructive approach to evaluate these microstructural alterations at a high level of precision. In this study, we present a comprehensive analysis of the microstructure of ZnO doped with various rare earth elements (such as Pr, La, Nd, Er and Sm) using XRD techniques combined with Rietveld refinement. By systematically analyzing the diffraction patterns, we extract detailed information about lattice parameters, crystallite size, strain, phase purity, and the precise location of dopants within the ZnO crystal lattice. The results highlight the effect of RE doping on the lattice expansion/contraction, the distribution of strain, and the evolution of secondary phases, which are often challenging to detect by other methods. The Rietveld refinement process enables the deconvolution of overlapping peaks and provides accurate quantification of the phase fractions, enabling a deeper understanding of the dopant’s role in modifying the microstructure. Moreover, we discuss the correlation between these microstructural parameters 54 and the resultant material properties, emphasizing the importance of controlled doping processes for the targeted enhancement of ZnO’s functionalities. This talk will explore the methodological advances in applying Rietveld refinement to RE-doped ZnO systems and demonstrate how non-destructive XRD analysis can be leveraged to guide the design of nextgeneration materials with tailored properties. The findings not only contribute to the fundamental understanding of REdoped ZnO but also offer valuable insights into the broader application of XRD in materials science for the non-destructive evaluation of complex, doped systems.
Fig.1: Experimental XRD data and calculated data (Rietveld data) with red for Pr:ZnO nanocomposites, at different Pr concentration.
Acknowledgments: This contribution was partially supported by Romanian Ministry of Research, Innovation and Digitalisation, through the μNanoEl, Cod: 23 07 Core Programme, and by PNRR/2022/C9/MCID/I8 CF23/14 11 2022 contract 760101/23.05.2023 financed by the Ministry of Research, Innovation and Digitalization in “Development of a program to attract highly specialized human resources from abroad in 55 research, development, and innovation activities” within the– PNRR-IIIC9-2022–I8 PNRR/2022/Component 9/investment 8.